The so-called reasonable tool geome

The so-called reasonable tool geometric parameters mean that under certain cutting conditions, the tool geometric parameters can ensure the slowest tool wear, the highest tool durability, the surface quality of the processed workpiece, and can meet the requirements of increasing productivity and reducing costs. . The geometric parameters of the tool include the following:(a) Cutting edge shape: such as straight edge, folded edge, arc edge, knife tip shape, etc.(b) Cutting edge area profile type (referred to as cutting edge area type): The cutting edge is commonly used, and negative chamfering and vibration reduction cutting edges can also be ground in the cutting edge area.(c) Type of knife surface: such as chip flutes on the cutting edge.(d) The cutting angle of the tool.The following issues should be paid attention to when choosing reasonable tool geometric parameters(a) Pay attention to the relationship between the geometric parameters: the shape of the edge, the area of ​​the edge, the surface of the edge and the angle of the tool are related to each other, and the role and influence between them should be considered comprehensively, and reasonable values ​​should be determined respectively. We cannot choose a parameter in isolation without considering the internal relationship between them.(b) Specific processing conditions should be considered: machine tools, fixtures, system stiffness and power, cutting parameters and cutting fluid performance should be considered. Generally speaking, in rough machining, the maximum durability of the tool must be guaranteed; in finishing, the machining quality must be ensured; for tools used in automated production lines, the working stability of the tool needs to be mainly considered, and sometimes it is necessary to focus on solving chip breaking. Problem: When the rigidity and power of the machine tool are insufficient, the tool should be as sharp as possible to reduce the cutting force.(c) Deal with the relationship between the sharpness of the tool and the strength and wear resistance: on the premise of ensuring the sufficient strength and wear resistance of the tool, strive to make the tool sharp; while improving the sharpness of the cutting edge, it should be Try to strengthen the knife tip and knife edge area. We cannot lose another one.